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