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