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