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