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