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