One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,7)(5,8)(9,10)(11,13)(12,14)(15,16)(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(1,3,6,2)(4,8,5,7)(9,11,12,15)(10,13,14,16)(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)(1,4,6,5)(2,7,3,8)(10,14)(13,16)(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)(1,5,6,4)(2,7,3,8)(10,14)(13,16)(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.