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