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