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