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