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