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