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