One vertex per element, one color per generator, with an edge from x to x·s.
(2,5)(6,8)(9,10,13,16)(11,14,12,15)(17,18,23,27)(19,24,22,26)(20,21,25,32)(28,29,30,31)(9,10)(11,14)(12,15)(13,16)(19,22)(24,26)(28,30)(29,31) involution — undirected(1,2)(3,6)(4,5)(7,8)(9,10)(11,14)(12,15)(13,16)(17,19,23,22)(18,24,27,26)(20,28,25,30)(21,29,32,31)(9,11,13,12)(10,14,16,15)(17,20)(18,21)(19,28)(22,30)(23,25)(24,29)(26,31)(27,32)(9,11,13,12)(10,14,16,15)(17,21)(18,25)(19,29)(20,27)(22,31)(23,32)(24,30)(26,28)(1,3,4,7)(2,6,5,8)(9,12,13,11)(10,15,16,14)(17,22,23,19)(18,26,27,24)(20,30,25,28)(21,31,32,29)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.