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