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)(19,22)(20,24)(21,23)(25,28)(26,29)(27,30)(31,32)(33,34,38,39,37,41,35,42)(36,40,44,46,45,48,43,47)(1,3,5,11)(2,6,8,9)(4,12,13,10)(7,15,16,14)(17,19)(18,22)(20,26)(21,25)(23,28)(24,29)(27,31)(30,32)(33,35,37,38)(34,39,41,42)(36,44,45,43)(40,47,48,46)(18,23)(19,25)(24,30)(26,31)(33,36)(34,40)(35,43)(37,45)(38,44)(39,46)(41,48)(42,47) involution — undirected(1,4,5,13)(2,7,8,16)(3,10,11,12)(6,14,9,15)(18,23)(22,28)(24,30)(29,32)(33,35,37,38)(34,39,41,42)(36,44,45,43)(40,47,48,46)(2,8)(6,9)(7,16)(14,15)(17,20,21,27)(18,24,23,30)(19,26,25,31)(22,29,28,32)(34,41)(39,42)(40,48)(46,47)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.