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