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