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