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