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