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