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