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