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