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