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