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