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