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