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