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