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