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