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