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)(17,18,23,19)(20,28,26,25)(21,31,32,30)(22,29,24,27)(1,3,4,8)(2,5,6,7)(9,11)(10,14)(12,15)(13,16)(17,19,22,29,23,18,24,27)(20,25,30,21,26,28,31,32)(2,6)(3,8)(9,12,13,10)(11,15,16,14)(17,20,23,26)(18,25,19,28)(21,29,32,27)(22,30,24,31)(2,6)(5,7)(11,16)(14,15)(18,19)(20,26)(27,29)(30,31) involution — undirected(2,6)(5,7)(17,21,24,25,23,32,22,28)(18,26,29,30,19,20,27,31)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.