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