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