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