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