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