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