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