One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,10)(8,15)(9,11)(12,16)(13,17)(14,20)(18,19)(22,28)(23,30)(25,26)(29,35)(31,36)(33,34) involution — undirected(1,2,3,4)(5,7)(6,10)(8,14)(9,13)(11,17)(12,18)(15,20)(16,19)(21,22,25,28,27,30,26,23)(24,29,33,35,32,36,34,31)(6,11)(7,13)(12,15)(14,19)(21,23,26,30,27,28,25,22)(24,31,34,36,32,35,33,29)(7,13)(10,17)(14,19)(18,20)(21,24)(22,29)(23,31)(25,33)(26,34)(27,32)(28,35)(30,36) involution — undirected(5,8,9,16)(6,12,11,15)(7,14,13,19)(10,18,17,20)(24,32)(29,36)(31,35)(33,34)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.