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