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