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