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