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