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