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