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