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