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