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