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)(16,19)(18,20)(21,22)(23,30)(24,28)(25,34)(26,29)(27,32)(31,35)(33,36) involution — undirected(1,2)(3,4)(5,7)(6,11)(8,16)(9,17)(10,18)(12,15)(13,20)(14,19)(21,23)(22,27)(24,32)(25,31)(26,33)(28,36)(29,35)(30,34) involution — undirected(2,4)(5,7)(6,11)(8,17)(9,16)(10,18)(12,20)(13,15)(14,19)(24,25)(28,34)(30,36)(31,32) involution — undirected(5,8,10,9)(6,12,14,13)(7,16,18,17)(11,15,19,20)(21,24,26,25)(22,28,29,34)(23,31,33,32)(27,30,35,36)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.