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