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