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