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