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