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