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