One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,9)(4,8)(5,6)(7,10)(11,15)(12,13)(14,16)(18,20)(19,26)(22,30)(29,31)(34,37)(39,42)(40,45)(46,48) involution — undirected(2,6)(7,9)(8,13)(14,15)(17,18,23,20)(19,21,26,24)(22,25,30,28)(27,29,32,31)(36,44)(40,45)(41,47)(46,48)(3,10)(4,12)(7,9)(8,13)(17,19,23,26)(18,24,20,21)(22,27,30,32)(25,31,28,29)(33,34,38,37)(35,39,43,42)(36,40,44,45)(41,46,47,48)(1,3)(2,7)(4,11)(5,10)(6,9)(8,14)(12,16)(13,15)(17,20,23,18)(19,21,26,24)(22,28,30,25)(27,29,32,31)(33,35,38,43)(34,39,37,42)(36,41,44,47)(40,46,45,48)(1,4,5,12)(2,8,6,13)(3,11,10,16)(7,14,9,15)(17,21)(18,19)(20,26)(22,29)(23,24)(25,27)(28,32)(30,31)(33,36,38,44)(34,40,37,45)(35,41,43,47)(39,46,42,48)(1,2)(3,7)(4,8)(5,6)(9,10)(11,14)(12,13)(15,16)(17,22)(18,25)(19,27)(20,28)(21,29)(23,30)(24,31)(26,32)(33,37,38,34)(35,42,43,39)(36,45,44,40)(41,48,47,46)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.