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