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)(20,28)(21,22)(23,24)(25,27)(29,30)(31,32) involution — undirected(1,3)(2,5)(4,8)(6,7)(9,10)(11,14)(12,13)(15,16)(17,19,22,23)(18,24,21,26)(20,29,31,27)(25,32,30,28)(10,13)(14,16)(17,20,22,31)(18,25,21,30)(19,27,23,29)(24,28,26,32)(2,6)(5,7)(9,11,12,15)(10,14,13,16)(17,21,22,18)(19,26,23,24)(20,30,31,25)(27,32,29,28)(3,8)(5,7)(10,13)(14,16)(17,19,22,23)(18,26,21,24)(20,29,31,27)(25,28,30,32)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.