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