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)(21,22)(23,25)(24,28)(26,29)(27,30)(31,35)(32,34)(33,36) involution — undirected(1,2,3,4)(5,7)(6,10)(8,14)(9,13)(11,17)(12,18)(15,20)(16,19)(21,22,25,29,27,30,26,23)(24,32,35,31,34,28,33,36)(6,11)(7,13)(12,15)(14,19)(21,23,25,22,27,29,26,30)(24,31,35,28,34,36,33,32)(7,13)(10,17)(14,19)(18,20)(21,24)(22,28)(23,31)(25,35)(26,33)(27,34)(29,36)(30,32) involution — undirected(5,8,9,16)(6,12,11,15)(7,14,13,19)(10,18,17,20)(21,25,27,26)(22,29,30,23)(24,33,34,35)(28,31,32,36)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.