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