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