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