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