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