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