One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,9)(4,7)(5,8)(6,11)(10,15)(12,14)(13,16)(17,18)(19,28)(20,22)(21,31)(23,25)(24,32)(26,30)(27,29) involution — undirected(1,2,5,8)(3,9,11,6)(4,7,12,14)(10,15,16,13)(17,19,23,32)(18,24,25,28)(20,29,30,21)(22,31,26,27)(33,34,38,39)(35,41,44,40)(36,45,47,37)(42,48,46,43)(4,12)(7,14)(10,16)(13,15)(18,25)(22,26)(24,28)(27,31)(34,39)(37,45)(40,41)(43,48) involution — undirected(1,3,5,11)(2,6,8,9)(4,10,12,16)(7,13,14,15)(17,20)(18,26)(19,29)(21,32)(22,25)(23,30)(24,27)(28,31)(33,35,38,44)(34,40,39,41)(36,46,47,42)(37,43,45,48)(1,2)(3,9)(4,7)(5,8)(6,11)(10,15)(12,14)(13,16)(17,21,23,29)(18,27,25,31)(19,30,32,20)(22,24,26,28)(33,36)(34,37)(35,42)(38,47)(39,45)(40,48)(41,43)(44,46)(1,4,5,12)(2,7,8,14)(3,10,11,16)(6,13,9,15)(17,22,23,26)(18,20,25,30)(19,31,32,27)(21,24,29,28)(33,37)(34,36)(35,43)(38,45)(39,47)(40,46)(41,42)(44,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.