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