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