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