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