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