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