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