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