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