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