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