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