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