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