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