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)(17,18,24,27,23,21,22,28)(19,29,26,25,31,20,30,32)(1,3,4,7)(2,5,6,8)(10,13)(11,15)(17,19,23,31)(18,25,21,32)(20,27,29,28)(22,26,24,30)(2,6)(5,8)(9,10)(11,14)(12,13)(15,16)(17,20)(18,26)(19,28)(21,30)(22,25)(23,29)(24,32)(27,31) involution — undirected(10,13)(14,16)(17,21,24,28,23,18,22,27)(19,29,26,25,31,20,30,32)(9,11,12,15)(10,14,13,16)(17,22,23,24)(18,27,21,28)(19,30,31,26)(20,32,29,25)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.