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