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