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