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