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